[RPi4] Bluetooth Pairing Error

pm33 · September 18, 2024 at 9:22 AM

Hello

I try to connect a LG sound bar called SP2 (78) to my kodi/libreelec 12.0.0 on a raspberry pi 4 .

When I do a connection action in Libreelec GUI I've got a "Br connection unknown"

Even I try i CLI I have the messages "type BR/EDR disconnected with reason 2"

All pairing dialog is below

Code

pair 54:15:89:45:56:78
Attempting to pair with 54:15:89:45:56:78
[bluetooth]# hci0 device_flags_changed: 54:15:89:45:56:78 (BR/EDR)
[bluetooth]#      supp: 0x00000001  curr: 0x00000000
[bluetooth]# hci0 type 7 discovering off
[bluetooth]# hci0 54:15:89:45:56:78 type BR/EDR connected eir_len 17
[CHG] Device 54:15:89:45:56:78 Connected: yes
[LG SP2(78)]# hci0 new_link_key 54:15:89:45:56:78 type 0x04 pin_len 0 store_hint 1
[LG SP2(78)]# [CHG] Device 54:15:89:45:56:78 Bonded: yes
[LG SP2(78)]# [CHG] Device 54:15:89:45:56:78 ServicesResolved: yes
[LG SP2(78)]# [CHG] Device 54:15:89:45:56:78 Paired: yes
[LG SP2(78)]# Pairing successful
[LG SP2(78)]# hci0 54:15:89:45:56:78 type BR/EDR disconnected with reason 2
[LG SP2(78)]# [CHG] Device 54:15:89:45:56:78 ServicesResolved: no
[CHG] Device 54:15:89:45:56:78 Connected: no

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Thanks for your help to resolve this point

**Da Flex** · September 19, 2024 at 12:08 AM

Update to LE 12.0.1. Older versions have an audio channel bug.

pm33 · September 20, 2024 at 4:03 PM

Hello

I upgarde to 12.0.1 but it's still the same

Same errors

Any idea ?

**Da Flex** · September 20, 2024 at 4:05 PM

Thanks. We need a complete log then...

Please provide a full debug log.

How to post a log (wiki)

1. Enable debugging in Settings>System Settings>Logging
2. Restart Kodi
3. Replicate the problem
4. Generate a log URL (do not post/upload logs to the forum)

use "Settings > LibreELEC > System > Paste system logs" or run "pastekodi" over SSH, then post the URL link

pm33 · September 20, 2024 at 7:40 PM

Hello

My logs are here

https://paste.libreelec.tv/wired-caiman.log

**Da Flex** · September 20, 2024 at 8:52 PM

Please check /storage/.cache/services/bluez.conf.

Code

Feb 27 18:26:06.611084 LibreELEC systemd[1]: bluetooth-defaults.service was skipped because of an unmet condition check (ConditionPathExists=!/storage/.cache/services/bluez.conf).
Feb 27 18:26:06.630146 LibreELEC systemd[1]: Started bluetooth.service.
Feb 27 18:26:06.630668 LibreELEC systemd[1]: obex.service was skipped because of an unmet condition check (ConditionPathExists=/storage/.cache/services/obexd.conf).
Feb 27 18:26:06.631087 LibreELEC systemd[1]: Reached target bluetooth.target.
Feb 27 18:26:06.636231 LibreELEC (uetoothd)[596]: bluetooth.service: Referenced but unset environment variable evaluates to an empty string: BLUEZ_ARGS, BLUEZ_DEBUG
...
Sep 20 20:39:13.587846 LibreELEC bluetoothd[596]: profiles/audio/avdtp.c:avdtp_connect_cb() connect to 54:15:89:45:56:78: Connection refused (111)

pm33 · September 21, 2024 at 9:44 AM

The file /storage/.cache/services/bluez.conf exists but is empty

Do i try to update to a nigtly build ?

**chewitt** · September 21, 2024 at 1:13 PM

The bluez.conf file is intentionally empty. If you want to start bluez with either BLUEZ_ARGS or BLUEZ_DEBUG variables defined; the variables go in that file. If the bluez.conf file is missing the bluez service doesn't start (as per the systemd service config). The sole purpose of it being created is to enable the service starting (same as for sshd, avahi, samba, etc.)

No idea what the issue with the soundbar is, but for the sake of creating a half-meaningful comparison; install RaspiOS on a spare SD card and see if that works. If it also fails at least things are consistent and that probably hints at something odd with how the soundbar responds to bluez. If it succeeds, it probably hints at software versions of bluez since I'd guess that LE is using a newer version than a general purpose distro. I might be wrong on that but it's often the case.

pm33 · September 21, 2024 at 5:22 PM

I try with a raspbian and the result is the same (br- error) and so on

So I need to find another solution

thank for your replies

**Da Flex** · September 21, 2024 at 6:52 PM

Read this:

Post

RE: [RPi5] Bluetooth Dongle on LE12

Ubuntu for RPi4 was even worse result. The dongle shows up but won't connect to anything. I found an interesting resource on the subject regarding BLE dongles and kernel patches: gist.github.com/nevack/6b36b82d715dc025163d9e9124840a07

And some good news: I downloaded and tried out the latest nightly on RPi4 (LibreELEC (community): nightly-20240811-266cfd7 (RPi4.aarch64) ), and it does not seem to have any problems with audio quality. The Sena UD100 dongle is plug and play after adding the…

mklod

August 12, 2024 at 9:00 AM